Core
Paint Calculator
How many litres of paint do you need? Coats, coverage and wastage, shown honestly.
InteriorOpen Calculator
Interior Calculators
Paint, tiles, flooring, false ceiling and modular work.
About our interior calculators
Finishing is typically 30-40% of a home's total build cost and is the stage most often under-budgeted. These calculators convert room dimensions into the quantities suppliers actually quote in — litres, boxes, running feet and square feet — including the wastage percentages that decide whether you make one trip to the store or three.